Meta-analysis of effects of regulated deficit irrigation on yield and quality of alfalfa
To explore the response of alfalfa yield and quality to regulated deficit irrigation under different influencing factors and provide theoretical basis for alfalfa planting,the comprehensive effect was quantitatively studied in the present study,as well as the main influencing factors under regulated deficit irrigation with full irrigation as the con-trol by integrating published relevant field test data and using meta-analysis method.The results showed that,com-pared with the full irrigation,the yield of alfalfa under regulated deficit irrigation decreased by 19.3％(95％confi-dence interval:-22.5％-16.0％),but the quality was significantly(P＜0.01)improved.The crude protein con-tent was increased by 14.5％(95％confidence interval:12.4％-16.6％),while the acid detergent fiber content and neutral detergent fiber content were decreased by 10.8％(95％confidence interval:-12.3％--9.2％)and 13.2％(95％confidence interval:-14.4％--11.9％),respectively.Given the yield and quality effects,annu-al average temperature of 0-5 ℃ and＞10-15 ℃,annual precipitation of＜200 mm and＞400-800 mm,the regulated deficit irrigation would be conducive for the alfalfa yield and quality with planting density of＞20-25 kg·hm-2.In different agricultural production areas,the regulated deficit irrigation with drip irrigation,regulated deficit at different growth period,and a regulated deficit degree of 75％-85％(based on the field capacity)would main-tain sound production effect of alfalfa.
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万方数据
